Markdown URLs within local directory not rendered correctly

[systolan]

Within a markdown document, residing in a sub-folder, an URL to another document within the same sub-folder over "./" is not rendered correctly on the resulting pages.

Steps to reproduce

1. create a markdown document inside a sub-folder
2. create a link in the form of [link](./other-document.md)
3. observe the link is correct (!) in the preview
4. save and close the document
5. observe the actual link is now incorrect (!) and points to the same document we just edited.

Host Info :

• OS: Ubuntu Server 18.04
• Wiki.js version: 2.2.51 dockerized as described on the docs
• Database engine: postgres 11.7

[Smankusors]

This is similiar, or duplicate of #1547, #1201